System for signalling power unbalance between electric power stations
First Claim
1. A system for transmitting electric power comprising:
- a direct voltage network;
at least two alternating voltage networks;
a first power station connected to said direct voltage network and one of said alternating voltage networks including;
converter means for transferring power bidirectionally between said direct voltage network and said one alternating voltage network;
means for regulating the direct voltage on said connected direct voltage network,means for sensing voltage pulses on said direct voltage network representing an unbalance detected by another power station connected to said direct voltage network, said means for sensing being connected to said means for regulating for regulating said direct voltage on said direct voltage network in response to said pulses; and
a second power station connected to said direct voltage network and another of said alternating voltage networks comprising;
means for transferring power bi-directionally between said direct voltage network and said another of said alternating voltage networks,means for detecting an unbalance on said direct voltage network, andmeans for generating pulses on said direct voltage network for identifying said unbalance to said first power station, whereby said first power station responds thereto by regulating said direct voltage in a direction to correct said unbalance.
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Accused Products
Abstract
A system for transmitting electric power between a direct voltage network and alternating voltage networks through VSC-converters. A first station which transmits electric power is in voltage regulating mode. Switching members at a second station are adapted to be alternatingly switched in and out upon occurrence of a sudden change of power so as to alternatingly connect one of the poles of the direct voltage network through an associated resistance to ground. A ground current generated therethrough is detected by a ground current measuring member of the first station, which is thereby informed about the unbalance. The first station then takes corrective measures to reduce or eliminate the unbalance.
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Citations
12 Claims
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1. A system for transmitting electric power comprising:
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a direct voltage network; at least two alternating voltage networks; a first power station connected to said direct voltage network and one of said alternating voltage networks including; converter means for transferring power bidirectionally between said direct voltage network and said one alternating voltage network; means for regulating the direct voltage on said connected direct voltage network, means for sensing voltage pulses on said direct voltage network representing an unbalance detected by another power station connected to said direct voltage network, said means for sensing being connected to said means for regulating for regulating said direct voltage on said direct voltage network in response to said pulses; and a second power station connected to said direct voltage network and another of said alternating voltage networks comprising; means for transferring power bi-directionally between said direct voltage network and said another of said alternating voltage networks, means for detecting an unbalance on said direct voltage network, and means for generating pulses on said direct voltage network for identifying said unbalance to said first power station, whereby said first power station responds thereto by regulating said direct voltage in a direction to correct said unbalance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification